Anti-feedant activity

The anti-feedant activity of these compounds has been tested against various insects, including food storage pests such as Tribolium confusum. 

Usnic acid (7.53)—a highly biologically active dibenzofuran—is a phenol oxidation product of an acylphlorogludnol. It is produced by numerous lichens, including several Usnea species. Apart from its antibiotic and anti-leukemic activity, it has insect anti-feedant activity. Its presence may account for the observation that many lichens are resistant to serious insect attack. 

DMemnimides. Indole alkaloids with potent anti-feedant activity on fish from the Caribbean mangrove ascidian Didemnum conchyliatum, e.g. D. A C,5H,oN402, Mr lli.n, orange needles, mp. 234 °C. 

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